Diodes Incorporated BC856AW-7-F

Overview

BC856AW-7-F from Diodes Incorporated is a PNP small-signal transistor in SOT323 package, rated for V_CEO = −65 V, I_C = −100 mA, and h_FE = 125–250 (Group A), optimized for switching and audio-frequency amplification in space-constrained PCBs.

For engineers reviewing the BC856AW-7-F datasheet, BC856AW-7-F pinout, BC856AW-7-F application, or BC856AW-7-F equivalent, key selection criteria include guaranteed h_FE group A performance at −2 mA/−5 V, low V_CE(sat) ≤ −300 mV at −10 mA/−0.5 mA drive, and JEDEC-qualified reliability for industrial ambient operation up to +150°C.

Technical Context

This device operates as a general-purpose PNP bipolar junction transistor with fixed emitter-base and collector-base junction structures. Its DC current gain is binned into three groups (A/B/C), with BC856AW-7-F specifically assigned Group A (h_FE = 125–250), ensuring predictable gain behavior in linear amplifier stages and saturated-switching configurations.

The transistor exhibits f_T ≥ 100 MHz at V_CE = −5 V and I_C = −10 mA, supporting stable AF amplification up to ~20 kHz with margin. Its −5.0 V V_EBO rating and −80 V V_CBO allow safe operation in moderate-voltage bias networks with reverse-emitter protection.

Key Specifications

Pinout & Package

Package: SOT323 - surface-mount plastic package with matte tin-plated leads, moisture sensitivity level 1, weight ≈ 0.006 g, UL 94V-0 rated molding compound.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP small-signal transistor applications.

Compared with BC856B-7-F and MMBT856LT1G, BC856AW-7-F offers the narrowest h_FE spread (125–250) in the smallest footprint (SOT323), making it optimal for production-critical analog gain stages where consistency and PCB area are jointly constrained.

Availability

BC856AW-7-F is available at Aetrix Electronics and suitable for audio pre-amplifiers, logic level shifters, and LED current sink drivers requiring stable component supply across industrial and consumer production programs.

Supply support for BC856AW-7-F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The BC856AW-7-F belongs to Diodes' BC856–BC858 family of PNP transistors, engineered for cost-sensitive, high-volume switching and amplification applications in consumer, industrial, and automotive-adjacent systems.

FAQ

What is the maximum operating temperature for BC856AW-7-F?

The BC856AW-7-F has an operating junction temperature range of −55°C to +150°C, verified per JEDEC standards. Its thermal resistance (R_θJA) is 625°C/W on a single-sided FR4 PCB with minimum pad layout, limiting practical ambient operation to ≤ +85°C at full 200 mW dissipation unless heatsinking or airflow is added.

Is BC856AW-7-F suitable for automotive applications?

No - BC856AW-7-F is a standard-grade part qualified to JEDEC reliability standards but not AEC-Q101. For automotive use, Diodes offers the Q-suffix variant BC856BWQ-13-F, which is PPAP-capable, manufactured in IATF 16949-certified facilities, and qualified to AEC-Q101 stress tests.

How does the SOT323 package affect PCB assembly yield?

The SOT323 package uses 0.65 mm lead pitch and 0.30 mm lead width, compatible with standard 8 mm tape-and-reel feeding and reflow profiles. Its moisture sensitivity level 1 allows indefinite floor life without dry-pack requirements, improving first-pass yield in high-mix SMT lines without baking steps.

Can BC856AW-7-F replace BC857AW-7-F in existing designs?

No - although both are PNP transistors in SOT323, BC857AW-7-F has lower V_CEO (−45 V) and V_CBO (−50 V). Substituting BC856AW-7-F may cause overstress in circuits designed for BC857's lower voltage ratings, especially where transient spikes exceed −45 V at the collector.